Selective call apparatus.



10. 850,887. PATENTED APIPA16, 1907. A. HULIT. SELECTIVE cALL APPARATUS.

APPLICATION FILED JULY 13 1906.

8 SHEETS-SHEET 1.

' F1873 WgflQQ a i wwfgenior A t :1 W i No. 850,837. v PATENTED APR. 16. 1907,.

A J, A. HULIT.

T sELEcTIvE cALL APPARATUS.

AIiPLIOATION TILED JULY 13, 1905-' 3 SHEETS-SHEET 2.

Ffgf f Ffg Fig.7 7 A MP)? e s E es V Inv'en tor I "j I a/ J. A., HULIT.

SELBGTIVE GALL, APPARATUS. APPLICATION FILED JULY 13, 1905.

PATENTED APR. 16, 1907.

JOHN A. HULIT, OF TOPEKA, KANSAS.

- SELECTIVE CALI. APPARATUS.

Specification of Letters Patent.

Patented April 16, 1907.

Application filed July. 13, 1905.. serial No. 269,470.

To all whom 11/; may concern.-

Be it known that I, JOHN A. HULIT, a citizen of the United States of America, residing at Topeka, in the county of Shawnee and State of Kansas, have invented new and useful Improvements in Selective Call Apparatus, of which the following is a specification.

Theinvention relates to devices whereby any one of a number of stations on a single electric circuit may be called or signaled without calling or signaling the other stations, useful on telegraph-lines, party-line telephone systems, and elsewhere Such devices are usually operable by combinations of electrical impulses and spaces, the respective stations being responsive only to certain predetermined combinations of signals.

It also relates to a system of thiskind in which the instruments may be called indi- -here into wit, Patent No. 795,839, dated 5 vidually or in, groups or all in concert at the will of the calling operator.

A patent has already been granted to me covering, broadly, some of the features shown August 1, 1905, for a selective call apparatus; but the improvements herein shown and claimed are not limited in their scope to use in connection with the devices shown in that application except as expressly limited in the appended claims; but they may be used with other mechanisms as well.

, Objects of the present invention are to improve generally upon machine's ofthis general nature and upon the several parts there:

of, to reduce the number of parts, to make the calling easier without in the case of the telegraph-call renderingthe instru. ent responsive ,to', ordinary characters, to plify thefmechanism, to provide an improved balance-bar of simple construction, to provide a balance-bar which moves slowly in both directions, to provide such a balance-bar moving slowly in both directions which will throw off the holding-pawl in one extreme position and throw it on in the other extreme position, to simplify in particular the selective feature, and to accomplish the variousobj ects hereinafter explained in detail.

In this invention, as in, the former one, I

preferably provide a combination of devices,

including a ratchet; whereby. a certain signal will progress all the ratchets and another oer? tam signal will normally return them to untial position, together with devices selectively arranged' and cooperating with the respective ratchets for preventing the return of the ratchet at times notwithstanding the sending of the signal, which. would normally have that effect.

In the former invention the trip-signal was a dot and the progressing-signal was a long dash, while in the present invention the pro- 'gressing-signals are a series of long dashes with short spaces between and the returning or trip signals are simply long spaces, so that withvthe present invention theperniutation may be accomplished by dividing the total number of dashes into groups with long spaces between the groups and short spaces between successive dashes in the same group, as will be hereinafter explained in detail.

The invention consists of the parts, improvements, and combinations particularly pointed out and claimed herein. I

In the drawings accompanying and forming part of this specification and in the description thereof 1 illustrate the invention in .its preferred form and show the best mode of applying the principles thereof; but it is to be understood that the invention itself is not confined to the drawings and the description of the drawings, that it may be applied to other uses, and that parts and combinations thereof as specifically and separately claimed may be used in connection with other devices of similar general nature, and that I contemplate changes in form, proportion, material, arrangement, transposition of parts, and the substitution of equivalent-members without departing from the spirit of the invention.

In the drawings I have shown the invention applied to a telegraph-line, the machine proper being included in a circuit controlled by the back contact of the. relay-armature, whereby on a normally open main-line circuit the local machine-circuit is normally closed. A

A Figure 1 is a sideelevation of the mechanism of the selective calling-machine, the near frame-plate and the ratchet-spring being resection, the view being taken approximately along the line 1 1 of- Fig. 3. Fig. 2 is sup plemental to .Fig. 1 and shows the parts immediately concerned in shifting the switch, such parts being hidden from view in Fig. l by the upright frameplate. Fig. 3 is a top or plan view of the machine, one of the stayrods being removed wholly and another partially. Figs. 4 and 5 are drawntoshow, in

I00 moved and some of theparts belng shown in connection with Fig. .1, the operation of the ratchet, the ratchet-progressing mechanism, and the throw-off mechanism for returning the ratchet toinitial position. In Fig. 4 I show how the holding-pawl is thrown off, permitting the ratchet to be returned when the electromagnet is energized, and in Fig. 5 I show the same operation except that the selective devices-are brought into play so as to preventthe return of the ratchet, notwithstanding the making of the signal which would normally threw off the holding-pawl and return the ratchet to initial position. Figs. 6 and 7 are details of parts not clearly disclosed in the'preceding figures. Fig. 8

- shows the operation, of the switch-shifting tact 12 to contact 13.

mechanism, the switch being here represented as thrown by the ratchet upon the sending of the proper combination for this particular machine. The frame-plate is here shown in outline, as the switch itself and its immediately-associztted parts, including the block of insulation on which-it is mounted, are on the outside of the frame, or back of the plate shown in outline. Fig. 9' represents the ratchet-s of a series of six of my selective calling-machines, whichmay be placed on the same line and be called individually or in groups or all in concert. This view shows the novel method of permutation, the selectivity being accomplished simply by making certain of the notches deeper than the normal ones. Fig. 10 represents one manner of the local wiring in diagram.

. Like reference numerals and letters indicate like or corresponding parts throughout the several views.

Reference is first made to the local wiring, Fig. 10. ML is the main line of a telegraphcircuit, including the relay R, of which 9 is the armature and 10 and 11 the front and back contacts, respectively. So is the sounder. LB is the local battery. Si is a suitable signaling device, as a bell, and M is the selective calling-machine, hereinafter to be described in detail, for shifting the switch S from con- EM is the electromagnet of the machine, and'14, 15, 16, and 17 are the binding posts.

connected up with suitable wiring, and the circuits are as follows: The local sounder-circuit may be traced commencing with front contact 10, thence through wire 18", wire 18 and binding-post 14 and sounder S0, wire 20, contact 12, switch S, wire 21 and bindingpost 17 and battery LB, and-armature 9 to contact 10. This circuit is normally open at 9 10. The selective-calling-machine circuit may be traced commencing with the,back contact 11, through wire 19 and binding-post 15; electromagnet EM, wire 20, contact 12, switch S, wire 21, and binding-post 17 and battery LB, and armature 9 to back contact 11. This circuit is normally closed. The local signaling-circuit may be traced com- These parts are mencing with the switch S, thence through back and front contacts, respectively, of 'the main-line relay. The switch Sis not directly controlled by the electromagnet EM," but indirectly by the mechanism shown in the other viewsl and in such manner that ordi nary sending will not affect it, but that each 'machine will be responsive only to certain combinations of characters, so as to throw, the switch S. When, however, the switch is shifted, the effect is that'the local signalingcircuit will be closed, so as to ring the hell or do any other thing to which it is adapted, and the local machine and sounder circuits will be opened at S 12, thereby diverting the current from LB 0 the signaling-circuit.

The signal Si sired place, as in the operators room, in the office, in the freight-house, his residence, anywhere that the alarm or call is desired.

In the illustrations of the machine proper I have shown it to be provided withthe four I binding-posts; but obviously the fourth need not be used if a separate sounder-circuit and ay be located; in any de- I battery be desired, and, indeed, in respect of the wiring thearr'angement may be modified to meet any condition or requirement.

Referring now to the machine itself, 101

represents the base, of metal, and is the surbase, of hard wood. Most of the parts of the machine are mounted between the up? shafts or pivot-rods-are mounted, preferably,

between screw-cup bearings'87 87. On the outside of one of the upright framelates 23 is secured a bloc-k of insulation, as liard rubber, by the screws 26 26. The switch S is a fine spring-wire secured to the block 25 by a plate 27, screwed thereto, which plate is connected with binding-post 17 by wire 21. between the two guide-posts 28 28 and tends naturally to rest against the platinum point of the rod 13, which is connected by wire 21 to binding-post 16: The switch S is normally held out of contact with 13 by the pin 12 in shaft 35, which shaft is mounted between the frame-plates 23 23, with the one end having in 12 extending out therefrom under the lock 25. Thewife from binding- 0st 15 pass '19 th' ugh the electromagnet M and thenr connects 99 wi h the metallic baseplate 22, and thence electric connection is continued through the frame-plates23 23 and shaft 35 to the pin=.12; Binding-post 1 4 The spring S extends down with it piece 32 and notch 33) is .connected with the base-plate 22 by the wire 18 and is thus connected with the pin or point 12 through the frame and shaft, but without passing through the electromagnet, in which manner the circuits are completed through the machine in the manner illustrated in the diagram Fig. 10.

The 'shaft 35 is provided with an upwardlyextending rod 36, a forwardly-extending rod 37, and two tail-rods 29 29, which last-named act merely as weights and stops.

On a shaft 31 is a piece 32, to which is secured a rod 30, and which is also provided with a shoulder or notch 33, engaged by the upper end of rod 36.

Normally rod 36 engages notch 33, thereby forcing the pin 12 against spring-switch S, which is forced away from the point 13, whereby the local sounder and machine circuits are normally closed at this point and whereby the local signaling-circuit is normally open,'and upon raising the rod (and the rod is released, thereby permitting the springswitch S to engage point 13, the weights 29 29 turning shaft 35 far enough to make a complete disconnection between S and 12,

thus opening the local sounder and machine circuits and closing the signaling-circuit. This secondary position is shown in Fig. 8.

On a shaft 41 is a spring 46, with one end attached to the shaft itself and the other end attached to the stud 47. Also secured on and'to the same shaft is a ratchet-wheel 42, and also on the shaft is the elbow-shaped rod 43. The ratchet-wheel has a pin 44, which normally, rests against the butting plate 45,

which.is secured to the two rods 45 45.

. sition.

These parts are so arranged that the spring tends to keep the ratchet in normal position, with pin 44 against butting plate 45, and upon propelling the ratchet againstthe tension of the spring the elbow-shaped rod wilL lift the rod 30 until rod 36 is freed from the notch 33 so as to shift the :witch, as described. In the illustration this shifting will be accomplished when the ratchet-wheel has been progressed nine notches from initial 'po- On a shaft 60, pivoted between'the two frame-plates, is the main propelling-lever 61', and on another shaft similarly pivoted is the bell-crank lever 61, to the upper arm ofv which the main lever is connected by a link 62, and to the lower end of which is allixed the armature-bar 63, controlled ,by the electromagnet EM, the two spools of which are secured by heel-plate .59 to lug 49. A small wood pin 64 serves to prevent contact between the armature 63 and the cores 58 58, although any other butting plate might answer just as well. An advantage in the employment of this double lever instead of single L-shaped lever is that a long travel of the propelling end of the lever may be pro- -j usted so as cured with a comparatively shoit travel of the armature-bar within the magnetic field of the electromagnet. This arrangement of the main propelling-lever is such that it is moved to its work to propel the ratchet upon the closing of the main-line circuit, which opens the local machine-circuit. Also the propelling-lever is moved to its work by gravity and is retracted therefrom by the energized electromagnet, it being understood that the long arm of the main lever is the heavier and that it can be adjusted by adding to or deducting operate with the exact force required, and that fluctuations in the amount of current will not injuriously affect the working of the machine.

At the other end of the lever 61 is pivoted the propelling-pawl 65, a light spring 69 holding it against a stoppin 70. The parts are so arranged that when the magi'iets are energized lever 61 is thrown up against the buffer-rod 80 with pawl clear of the ratchet-wheel, and when the-magnets are demagnetized gravity brings the lever down against another rod. 81, the pawl being adtomove the ratchet forward one tooth or notch and no farther.

. To a shaft 75, pivoted between the upright frame-plates, is secured a holding-pawl 73, an u iwardlyextemling rod 90, a downwardly-extending rod 76, a forwardly-extendingrod' 54, whose end may be provided with a shoe 55, and the rearwardly-extend ing rod 38, the parts being so weighted as to tend naturally to force the holding-pawl into engagement with the ratchet;

Obviously the closing of the main-line circuit nine times would have the effect with the mechanism so far described of shifting the switch. To make the switclii-shifting mechanism responsive only to certain combinations is the object of the devices now to be described in connection with the forego- To a shaft 57, pivoted between the upright frame-plates, are secured an elbow-shaped 'supportingrod 58, a trip-rod 71 and a tailrod 72 so weighted'and adjusted as to tend to the position shown in Fig. 4, tail-rod 7 2 being down and rod 71 up, in which position rod 58 will support rod 54, (or the shoe 55 thereon,) so as to retain the holding-pawl out of confrom its weight, so as to tact with the ratchet-wheel; but upon depressing trip-rod 71, and thereby moving rod 58 away from under the end of'rod. 5.4, (or shoe 55,) the holding-pawl will be free to move into engagement with the ratchetwheel.

On apivoted shaft 66, also'e rtending between suitable bearings on plates, is the main balance-bar 66, whose rearward end 67 is the heavier. This bar is adapted to move or-oscillatehetween two extreme positionsfrom that shown in .Fig. 1

the upright frameto that shown in Fig. 4. In the first position one end strikes against the buffer 77, and in the second position the other end strikes against'the buffer 80.

The balance-bar has at one end a tripper 78 to engage the trip-rod 38 when in the second position, and at the other end is the tripper 7 4, adapted to depress the trip-rod 71 in the first position. It will be observed 10 from the drawings that the balance-bar hasa sufficient range of action that it may move some little distance between the extreme positions without engaging either trip-rod 38 or trip-rod 71. This is shown clearly in Fig. 5, where the balance-bar is suspended about midway between its two extreme positions and is, clear of bothsaid trip-rods.

When the balance-bar falls or has fallen to the second position (shown in Fig.- 4)'by its own weight, so as to engage and depress the trip-rod 38 ,which is fastened to the shaft 75, to which the holding-pawl is also secured, the effect is to disengage the holding-pawl from the ratchet-wheel and keep it disengaged therefrom all the time that the balance-bar remains in that position, and also as the other end of the balance-bar is in this osition elevated, and thus frees trip-rod 71 om tripper 74, the shoe and rod54 being elevated above rod 58, said rod 58, and with it the shaft 57, rod 71, and rod 72, will fall in accordance with their natural tendency, with tailrod 72 resting on buffer 56 and rod 58 under and supporting the end of rod 54, as shown 3 5 in Fig. 4. Supporting-rod 58 will thus retain the holding-pawl disengaged from the ratchet until the main balance-bar is moved to its other extreme position, so as to trip the rod 71. To move the balance-bar to that other positionyi provide an intermediate lever or an intermediate balance-bar between the main balance-bar 66 and the 'main propellinglever 61, as will now be explained.

The intermediate lever, which may alsobe 4 5 variously termed an intermediate balane bar or an auxiliary balance-bar 40, is mounted on the pivot-rod 39, which extends, as the other pivot-rods, between suitable bearings in the frame-plates 23 23. One'end 5c of this intermediate lever extendsin the form of a 1i ht-wire, rod 52 under a pin 53 in the side 0 the heavier end of the balance-bar.

The other end 40- of the intermediate lever is the heavier and is heavy enough to raise the 5 5 heavier end of the main balance-bar when the end 40 of the intermediate bar is unsupported and permitted to fall by gravity. The intermediateleveris connected in oneway engagement with the main propelling-lever 61 by means of the two-legged link 50, which is pivoted in t the intermediate lever and whose legs straddle the pin 51 in the main ropelling-lever, so

that when the main prope ing-lever is raised 65 by energizing the electromagnets the heavier said rod 81 from being turned with the ten- 6 recess 48 in the heavier end of teaser end of the intermediate lever is also raised therewith and the other end 52 is lowered, and this permits the main balance-bar to fall in accordance with its natural tendency to the position shown in Fig. 4. The main balancebar, however, beingabout equally balanced and being rather heavy will move sluggishly or slowly and not quickly as the propellinglever or the intermediate lever when the v main propelling-lever is raised, and, again, when the magnets are denergized, permitting the'main propelling-lever to fall quickly, the heavy end 40 of the intermediate lever will not fall quickly with the main pro ellinglever, but by reasonof the other en 52 engaging and raising the heavier end of the balance-bar the said end 40' will fall slowly and the heavier end 67 of the main balance-bar will be raised slowly, and thereby sent to the position shown in Fig. 1. These two balance bars together constitute a compound balance-bar which moves or oscillates slowly in'both directions notwithstanding the fact that the main propelling-lever moves quickly in one. direction by the force of gravity and in go the other by the electromagnets. These two balance levers must be constructed with proper relation to each other, so as to movesomewhat slowly, and yet their motion must be heavy or decided enough to trip the rods 5 71 and 38, respectively, as explained. Neither, on the other hand, should they be 'too heavy, so as to be-not operable'by small.

batteries.

As a devi'cefor manually restoring the parts to initial position after the switch has been shifted, I rovide the arts associated with rod 81, as ollows: Sai rod has a coil-s .ring 82 and a rod 83 engaginga bufler 80 to eep I o 5 sion of the spring, a forwardly-extendin rod 84 to engage the under side of the prope inglever 61, a rod 85 to'engage trip-rod 36, and a tail-rod or handle'86 whereby it is operated. By depressing handle 86 (against tension of spring 82') the rod 84 raises the main. pro 11in -lever, freein the ratchet from the pus -paw and the rof 85 restores rod 36 to engagement with notch 33. It is seen that when the switch has been thrown rod 37 engages rod 76, thereby holding the retainingpawl out of engagement with the ratchetwheel. Theparts are so adjusted that the push-pawl is released before 37 is released 1 from 76, thereby permitting the spring to I20 quickly restore the ratchet-wheel to initial position before the'wheel is engaged by the I oldingawl. This action-of restoration is practica yinstantaneous."

-We now come to the selective features- I2 that is, the features wherein the several ma-, chines differ from each other so as t'o be dividuall res onsiveto signals. In-the illus tration t e se ective feature lies in mat some of the teeth ornotchjes ofthe ramhetifim Lil wheel which are engaged by the holdingpawl deeper than the others that is to say, all the teeth are of a normal depth except certain selected o ies. Thus in the main illustration the fourth and sixth notches of the ratchet-wheel are deeper than the others. In the A wheel, Fig. 9, the fourth and fifth arethe deeper ones. In the C wheel the fourth and seventh, in the D wheel the fifth and sixth, in the E wheel the fifth and seventh, and in the F wheel the fifth and eighth'are the deeper notches. Thelocation of these deep notches are the only parts in this arrangement in which the machines difler from each other. A pin 79 projects from the side of the balance-bar 6d, and said pin. and the upright rod 90 are so related to each other that when the holding-pawl engages a notch of normal depth the rod will have a position out of the path of said pin 79, as in Fig. l, and when the holding-pawl"-engages a deep notch the rod 90 will be carried around a little farther, so as to be directly in the path of the pin 79, and thereby suspending the main balance-bar 66 about midway between its two extreme positions and free from both trip-rods and 71, as plainly shown in Fig. y

In explaining'the operation of my appara tus I assume that the calling instrument is connected up with the circuit controlled by y the back contact of the relay of a normally 40 of the intermediate lever will be raised,

the main balance-bar will occupy its natural position with its heavier end 67 down against trip-rod 38, thereby throwing oil' the holding-pawl and raising rod 54, thereby permitting supporting-rod 58 to tilt forward under the end of said rod 54. As both the propelling-pawl and the holding-pawl are out of engagement with the ratchet, the ratchet is held in initial position with pin 44 against buttinglate 45, with the point of the holding-paw opposite the zero notch. These positions are shown in Fig. 4. The switchshifting mechanism normally occupies the positions shown in Figs. 1 and 2, as hereto fore fully explained.

Now suppose the main line be closed. The main propelling-lever will fall, bringing the propellingpawl into engagement with the ratchet, progressing the ratchet one notch from initial position. Pin 51 is 'With drawn from link 50, thereby permitting the heavier end 40 of the intermediate lever to fall by gravity, which raises the other-end 52, carrying the heavier end 67 of the main balance-bar up also and with it the rod 78 is carried away from' trip-rod 38. Now the balance-bar moves sluggishly or slowly, and therefore it takes some space of time for it to be moved from its normal position to its otl.u r

position-with rod 74 in engagement with triprod- 71, and in the interim the holdingpawl is held out of engagement with the ratchet by reason of rod 54 being supported on supporting-rod 58, notwithstanding the Withdrawing of 78 from 38. Hence if the main line be opened before the balance-bar has moved its full clistance that is, before it has brought 74 to depress 71, so as to trip 58 from under 5 ithe raising of the main propelling-lever will take the propelling-pawl away from the ratchet, and thereby permit I be so adjusted that the main balance-bar will move with the desired speed. I contemplate, however, so adjusting them that the time required to make the full stroke of the balance-bar in the direction just described will be a little longer than the ordinary dash of the Morse code, so that either a dot or a dash of the Morse code will have the effect of returni'm the ratchetto initial position, as described. The desired dash may be as long as the operator may 'wish to make it to be safe; but it cannot be shorter than the time required by the balance-bar to make thefull stroke.

If now after the long dash just described the main line be opened for some space of time, (a long space,) the parts will return to normal positions, as shown in Fig. 4, with both pawls disengaged from the ratchet and the ratchet in initial position. Thus a long dash followed by a long space will still have the effect of returning the ratchet to initial position.

If, again, instead of a long space the long dash be followed by a short space, the action will be as follows: When the main propellingbar is raised, the heavy end 40 is raised quickly with it, thereby dropping the end 52 and permittii'ig the heavier end 67 of the balance-bar to fall, or rather to start to fall, and at the'sa'me time freeing 7-l from triprod 71. Upon quickly closing the main line again the propelling-pawl engages the ratchet, progressing it one notch. The pin 51 is again withdrawn from 50, permitting the heavy endAO IOC to fall and the other end to be raised, thereby j z heretofore pointed out.

that if a long space be made between any brings the push-pawl into engagement with the ratchet and progresses it, the holdingpawl will by-the action of the teeth against it be momentarily thrown ofi, and this throwv 5 ing off will be sufficient to raise rod 54 and permit the rod 58 to come und'er it, (74 bein now raised,) whereby the holding-pawl w1l be held disengaged from the ratchet until the main balance-bar again is brought to engage Thus if the long dash and short space be followed by a dot the ratchet will be returned to initial position; but if the long dash and the short space be followed by another long dash the ratchet will be progressed two notches and will be held there until either progressed by further lon dashes and short spaces or returned by a ot or a. longspace.

In similar manner if nine of the long dashes be made in succession on the main line with the short spaces between, as just described, the ratchet-shaft will be turned to the point where arm 43 will lift and release 36, thereby shifting the switch of the machine, as It is also now clear two of the long dashes the effect will be to return the ratchet to initial position except when the holding-pawl engages a deep 30 notch, and a similar effect will follow the making of a dot. The dashes after the first one need not be so long as that one, much depending upon the relative adjustments, as well as the relative lengths of the spaces. The

3 5 spaces may be as short as it is possibleto make them. The ratchet will be duly progressed by reason of gravity and will quickly bring the push-pawl to its work. Although it may be that. an operator will sometimes unintentionally make a dash long enough to progross the ratchet, it isnot likely that any one will make the necessary succession of such characters unless he desires to make the call.

The ordinary characters may thus'be said to p a, 5 be absorbed by the balance-bar.

If but a single machine be placed on a line, it may be made responsive simply-to the long dashes and short spaces, so as to require in the main illustration simply the making of the nine long dashes with short spaces between, and

long space, with the six machines. on the line as illustrated b the ratchets shown in Fig. 9, the machines aving ratchets A, B, and C will not return their ratchets to initial positions, for the reason that the fourth notches of these ratchets are deep ones and-permit pin 79', whereby the balaii'ee baris suspended on the said rod. 90 Without, engaging 38 and throwing off the holding-pawl, notwithstanding'the making of the long space, .as shown in Fig. 5; but this same long space will have the effect of returning the ratchets of machines D, E, and E to initial positions, becausethe fourth notches of these ratchets areof normal depth and keepvrod 90 out of the path of in 79, thereby permitting the main balancebar to fall its full stroke and throw off the holding-pawl; and if this long space be followed by five long dashes with the short spaces between the switches of the first three machines will be shifted and the bells rung without affecting the latter three machines. long dashes, a long space, and four long dashes the bells of the latter three machines will be rung without disturbing the others. Similarly by making the combination of four long dashes, a long space, two long dashes, a long space, and three long dashes the B bell will be rung without ringing the others, for the reason that the long space after the sixth dash will return ratchets A and C, the long space after the fourth long dash having returned the latter three. These individual combinations may be briefly designated by the groups of dashes thus: The individual combination for the A machine is 41'-4; B, 4-2-3 0, 4-3-2; E, 5-1-3 E, 5-2-2; F, 5-3-1. The group-call for the A, D, and 0 machines is 4-5, for the A, D, E, and F machines is 5-4, for the B and D machines 6-3, for the (J and E machines 7-2, while nine straight dashes will call them all.

The method of permutation herein followed is the same as that shown in the former atent referred to except that here I use the By making the combination of f ve ong space as a throw-off signal, while in theformer device I use a dot, and this method,

broadly speaking, is fully covered and explained in that application.

What I claim is 1. The combination of the switch-shifting ratchet, a ropelling device and a holding- IIO pawl there or, and a compound balance-bar adapted to move slowly by the force of gravity in both directions.

2. The combination of the switch-shifting ratchet, a ropelling device and a holdingpawl there or, and a compound balance-bar adapted to move slowly by the force of gravity in both directions. 4

3. The combination of the switch-shifting ratchet, a propelling devicev and a holdingpawl therefor, a compound balance bar adapted to move slowly by the force of gravity in both directions, together with suitable connections whereby the balance-bar in one position throws off the holdingawl and in another position engages it with t e ratchet.

4. The combination of a switch-shifting ity both ways between; two positions and;

by the 'force of gravity both'waysbet-ween" two positions and adapted-in one position to ratchet, a'propelli'ng device and a' holding pawl therefor, and a compoundbalance-bar adapted to' move slowly by the force of gravadapted inone position to throw off the hold-, in'g-pawl and in-the other position to throw it into engagement with the-ratchet.

5. The combination in an apparatus of'the kind set forth of the'combination ratchet and propelling and holding pawl's therefor, acompoundbalance-bar adapted tomove slowly throw off, and in the other position to throw on the holding-pawhand suitable means for operating the propelling-pawl and the lbalance-bar. I

6. The combination of a switch-shifting ratchet, a propelling device and a holding-' pawl therefor, a compound balance bar adapted to two positions and to'move slowly by theforce of gravity both ways therebetween, means for operating the propelling dev vices and the balance-bar, and suitable con- I nections intermediate the balance-bar and the holding-pawl whereby the balance-bar is adapted in one position to throw off, and in the other position to throw on, the holdingv pawl. 7. The combination of theswitchrshifting ratchet, a propelling device and'a holdingpawl therefor, a compound balancebar adapted to two positions and to move slowly by the force of gravity both ways therebetween, and suitable ,meansintermediate the balance-bar and the ratchet whereby the balance-bar is adapted in one position to throw off the holding-pawl, and in-the other posi-' tion to throw it on.

8. The combination of the switch-shifting ratchet, a propelling device and a holding-' pawl therefor, a balance-bar adapted to two positions and to move slowly therebetween, suitable means intermediate the balance-barand the ratchet whereby the balance-bar is adapted in one position to throw off the holding-pawl, and in the other position to throw it on, and means selectively arranged to pre vent the return of the ratchet notwithstanding the throw-off signal. I

9. The combination of the switch shifting ratchet, a propelling device and a holding-' pawl therefor, a balance-bar adapted to two positions and to move slowly both ways,

therebetween, suitable means intermediate the balance-bar and the ratchet whereby the balance-bar is adapted in one position to throw off the holding-pawl and in the other position to throw it on, and means selectively arranged and cooperating with the ratchetior preventing the balance-bar from throwing oii" the holding-pawl.

1 0. The combination oi the switch-shifting ratchet, a propelling device and a holding positions and to move slowly both ways therebetween, suitable means whereby the ratchet. is adapted in one position to throw oil the holding-pawl and in the other position to throw-it on, a trip'devicefor preventingthe balance-bar from throwing oi? the ho'ldmgpawland means cooperating with the ratchet and selectively; arranged for bringingv said trip device into play.

11. The comb'nation with the ratchet, a 7 5 propellin I device and a-holding-pawl therefor,ia ba ance-baradaptedjto two positions and to move sl'owlyboth ways thereb'etween, suitable means whereby the balance-bar is adaptedi'n one position to throw off the holdingpawl and in the other-to throw it on, a "trip device for preventin the return of the ratchet notwithstanding t e operation which normally throws off the holding-pawl, and means cooperating. with-the ratchet and selectively arranged for bringing said trip deviceinto play.

12. The combination with the ratchet, a propelling device and a holding-pawl therefor, a balance-bar adapted to two positions and to move slowly both ways therebetween, suitable means whereby the balance-bar is adapted in one position to throw off the holding-pawl and in the other to throw it on, a trip device-to prevent the balance-bar from throwing ofi the holding-pawl and teeth of extra depth-in the ratchet engaged by the holding-pawl and selectively arranged to bring said trip device into operation.

' 13. The combination of a retractile switchishifting device, propelling and detaining means therefor, and a compound balance-bar adapted to'two positions and to move slowly by the force of gravity both ways therebetween, and suitable means whereby the balance-bar in one position throws off the 'de-' 'taining means and in theother position throwsiit on. 14. The combination of aretractile switchshifting device, propelling and detaining means, therefor, a balance-bar adapted to two positions and to move'slowly both ways therebetweerflsuitable means whereby the balance-bar in one position throws oil the de- I taining means and in the other position 1K5 throws it on, and devices cooperating with the switch-shifting device forselectively preventing-the return of said device notwithstanding the operation of the balance-bar normally tending to throw off the detaining means;

15. The combination with a ratchet and propelling and holding pawls therefor, of a throw-off for the holding-pawl and actuating means for the propelling-pawland the throwoii, a trip to preventthe said throw-oh from, I 5 engaging the holding-pawl, and notches of extra depths selectively arrangedfor bring- *ing" said trip into operation.

'pawl therefor, a'balannd-bar adapted to two 65 16. The combination with a ratchet and propelling and holding pawls therefor, of a balance-bar for controlling the holding-pawl, and notches in the ratchet of other than nor' mal depth and selectively arranged for preventing at times the balance-bar from throwing off the holding-pawl.

17. The combination with a ratchet having two depths of teeth and propelling and; holding pawls therefor, a balance-bar controlling the holding-pawl, actuating means for the propelling-pawl and for the balancebar, and devices controlled by the ratchet- .teeth for preventing at times according to the depth of the tooth engaged the'return of the ratchet notwithstanding the action of the balance-bar normally tending to throw off I the holding-pawl.

18. The combination of the ratchet and propelling and holding pawls therefor, a main propelling-lever and an electromagnet for actuating the same, a main balance-bar tending normally to throw off the holdingpawl and adapted in another position to throw it on, and an auxiliary balance-bar tending naturally to force the main balancebar to its second position but held normally in a secondary position permitting the main balance-bar to assume its normal position, a trip for preventing the 'main balance-bar from ithrowlng oil" the holding-pawl and meanscooperating with the ratchet and selectlvely arranged for bringing the trip into operation. 19. The'combination of the ratchet and propelling and holding pawls therefor, a main propelling-lever'and an electromagnet, 'famain balance-bar adapted to two positions and tending naturally to one position, and an intermediate balance-lever tending naturally to force the main balance-bar from its natu'-- ral position and connected in one-Way enpush and holding 1 20: The, combination I inain propelling-lever gagement with the main propelling-lever.

of the ratchet and the holding and propelling pawls therefor, a and an electromagnet, the main balance-bar and an auxiliary balance-bar actuating the main balance-bar in one direction whereby the main balance-bar moves slowly in both directions, and devices whereby in one position the main balancebar throws off the holding-pawl and in the other throws it on.

21. The combination of the electromagnetand a main propelling-lever, a ratchet and awls therefor, a gravityoperated main balhnce-bar, and a gravityoperated auxiliary balance-bar actuating the main balance-bar in one direction whereby the main balance-bar moves slowly by the force of gravity in both directions.

= 22. The combination of the ratchet and push and holding pawls therefor, an electromagnet and a main propelling-lever, a balance-bar adapted to move slowly in both directions between two positions and to throw oif the holding-pawl in one positlon and to throw it on in the other, asup orting-rod to support the balance-bar free ing-pawl, and selective devices cooperating with the'ratchet for operating said supportin -rod.

l23. The combination of a switch-shifting ratchet and push and holding pawls therefor, an 'electromagnet and a main propelling-lever, a main balance-bar tilted in one way by gravity, an auxiliary balance-bar tilted in one way by gravity to move the main balance-bar against the force of gravity and connected 1n one-Way engagement with-the main propelling-lever, and the selective devices cooperata ing with the ratchet to prevent the balancebarfrom throwing off the holding-pawl.

24. The combination of a switch-shifting ratchet and push and holding pawls therefor, an electromagnet and a main propelling-lever, a main balance-bar tilted in one way to throw off the holding-pawl by gravity, an intermediate balance-lever connected in oneway engagement with the main propelllnglever, and also connected in one-way engagement with the main balance-bar and adapted to move the main balance-bar by gravity to throw on the holding-pawl, and devices selectively arranged and cooperating with the ratchet to prevent thereturn of the ratchet notwithstanding the operation of other parts normally adapted to return the ratchet.-

25. The combination of a switch-shifting ratchet and push and holding pawls therefor, an electromagnet and a main propelling-lever, a main balance-bar tilted in one way by gravity to throw off the holding-pawl, and an intermediate balance-lever connected in oneway engagement'with the main propellinglever and also connected in one-way engagement with the main balance-bar and adapted by gravity to move the main balance-bar to throw on the holding-pawl.

26.; In mechanism of the. kind described, the combination of the shaft 35 and a tripper therefor controlled by the ratchet and having the pin 12, the ratchet and mechanism for operating the same, the the contact 13.

27. In mechanism of the kind set forth,

spring-switch S, and

ropelling mechanism therefor, a balancebar, a holdin -pawl tending naturally to engage the ratc et and'adapted to be thrown off by the balance-bar, a tri -su port 58 tending naturally to free the liol in -pawl from the ratchet and adapted to be t rown from its natural, position by the balance-bar.

28. The combination of the switch-shifting ratchet and propelling and holding pawls therefor; a circuit including a battery and an electromagnet; a propelling-lever conom the holdthe combination of the switch-shif ting ratchet,

trolled by the eleotromagnet; together with suitable mechanism whereby a stroke of the lever will propel the ratchet a short stroke not holding it progressed and a long stroke throwing on the holding-pawl and whereby a short s ace between strokes will not throw ofi the Y olding-pawl and a long space willre by the electromagnet; together with suitable propelling-pawl, and a balance-bar cooperat,

ratchet and holding and mechanism whereby a stroke of the lever will propel the ratcheta short stroke not holding it at its progressed stage and a longstroke throwing on the holding-pawl and whereby a short space between strokes will not throw ofi the holding-pawl and along space will return the ratchet; together with devices selectively arrangedto prevent the return of the ratchet notwithstanding the long space.

30.. The combination of a series of selective calling devices of the kind set forth, each comprising a switch-shifting ratchet, a circuit including a battery and an electromagnet; a propelling-lever controlled by the electromagnet'; suitable mechanism whereby a stroke of the lever will propel the ratchet a short stroke not holding it at its progressed stage and a long stroke throwing on the holding-pawl and whereby a .short space between strokes will not throw off the holding-pawl and a long space will return the ratchet; together with devices selectively arranged to prevent the return the ratchet notwithstanding the long space; whereby all the ratchets are progressed at each stroke and all the ratchet-returning mechanisms are operated 'in unison, and whereby said last-mentioned mechanisms are selectively prevented from returning the ratchet notwithstanding the long space.

31. The combination of a ratchet; a balance-bar, a mainpropellingdever and a proelling-pawl; a holding-pawl; a trip-support for the balance-bar adapted in one sition to sustain the bar away from the oldingpawl, and in another position to ermit the bar to throw off theholding-paw and devices selectively arranged to control said tripsupport.

32. A series of ratchets; a holding-pawl, a

mg with each ratchet; and a trip device controlled selectively by the ratchet and adapted in one position to permit the balance-bar to throw off the holding-pawl and in another position to keep the bar free from the holding-pawl.

33. The combination of the main lever; a ropelling pawls therefor; a balance-bar; an a trip device selectively controlled by the ratchet'for controlling the action of the balance-bar with relation to the holding-pawl.

34. The combination of a switch-shifting ratchet, a propelling device and a holding-.

pawl therefor, a balance-bar adapted \to i move between two extreme ositions and t0 be moved in at least one irection by the force of gravity, together with suitable means whereby the bar in one position throws oil the holding-pawl and in the eother extreme position throws. it back into engagement with the ratchet, the holding-pawl being so arranged as not to be returned to the ratchet until positively acted upon by the balance-bar at the end of its stroke. .1

35. The combination of a switch-shifting ratchet, a'propelling device and a holdingpawl therefor, a balance-bar adapted to move slowly both ways between two extreme positions and being adapted inone of said extreme positions to throw off the holding-pawl and in the other of said extreme positions to throw it into engagement with the .ratchet,

and said holding-pawl being so arran ed as not to en age-the ratchet until so acte upon by the ba ancebar.

36. The'combination of a switch-shifting ratchet, a propelling device and a holdingpawl therefor, a balance-b ar adapted to move slowly both ways between two extreme positions and being adapted in one of said extreme positions to throw ofl the holding-pawl and in the other to throwit into en agement with the ratchdfijsaid holding-pawl being so arranged as notjito. engage the ratchet until so acted upon by the balan'cebar together with means selectively arranged for preventing the 3 balance-b ar from throwing oif the ratchet.

37. The combination of a switch-shifting IOC ratchet, a propelling-lever and a detent therefor, a slowly-moving throw-oif con' trolled by the propelling-lever, said propelling-lever being arranged -to propel the ratchet at all times independently of the throw-off.

38. The combination of a switch-shifting ratchet, a propelling-lever and a detent therefor, a balance-bar acting by its own force to throw off the detent, said propellinglever being adapted to'propel the ratchet at all times independently of the balance-bar, to restore the balance-bar upon its back stroke and to release the-balance-bar on its forward stroke. v

39. The combination ofa switch-shifting ratchet, a propelling-leverand a, detent therefor, a balance-bar acting by the force of gravity to throw off the detent; said propel- IOS ling-lever being adapted to propel the matchet at all times independently of the bal- 1 ance-b ar, to restore the balance-b ar on its re- 1 2 5 turn stroke and to release the balance-b ar on its f orwa rd strokeso that said balfincebar ,Inay then.start upon its travel toward the detent.

fbr pun enting the fi hrowQfi -gfrqhf t ing upon the said holding-pawl; [o

q 1 I n testimony whereof I havqhe rqunm set v40-. The combination of a switch-shifting my handin the presence ofwifnesseg/ 5 ratchet,,a prdpellin g device and a holding- I JOHN liULl-T; pawl therefor, a throw-off, means cofiperat- Witnessesr; 3 1 1; H ing with thei'atchet and selectively arranged C. J. R'0SEN,'

Land acting directly upon theholding-pawl- 

